Electric soldering-iron



F. EICHENBERGER.

ELECTRIC SOLDERING IRON,

APPLICATION FILED APR. 8, 1920.

1,361 ,032. Patented Dec. 7, 1920.

UNITED surge FERDINAND EICHENBERGER, or AARA e renr OFFICE.

U, SWITZERLAND, ASSIGNOR T0 .AKTIEN- CORPORATION.

Specification of Letters Patent.

ELECTRIC SOLDIERING-IRON.

Patented Dec. 7, 1920.

Application filed April 8, 1920. Serial No. 372,343.

To all whom it may concern:

Be it known that I, FERDINAND EIGHEN- BERGER, a citizen of the Swiss Confederation, and residing at Aarau, Switzerland, have invented a certain new and useful Improvement in Electric Soldering-Irons, of which the following is a specification.

This invention relates to electric solder ing-irons, and a primary object is to provide a construction wherein a heater can be readily'inserted into the head of the iron in such a manner that its heat is efiiciently transferred to the bit.

An electric soldering-iron according to the invention comprises a head preferably of aluminium, that has a bore running in the direction of the handle, and a cut extending in the same direction and opening into the bore, and an electric heater fitting into and clamped in the bore.

The invention consists in the construction, arrangement and combination of parts described hereinafter and pointed out in the claims.

One embodiment of the invention is illustrated by way of example in the accompanying drawing, wherein Figure 1 is a side elevation of one form of electric soldering-iron according to the invention,

Fig. 2 is an end elevation thereof,

Figs. 3 and 4 are longitudinal section, and end elevation, respectively, showing the electric heater, and

Fig. 5 is a longitudinal section showing means for connecting the heater to a supply of current.

Like reference letters designate like parts throughout the several views.

An aluminium head 7) of a soldering-iron has a cylindrical bore m into which fits a cylindrical heater a of refractory heat conducting material which comprises a resistance wire a and is surrounded by a layer 0 of heat-insulating material. The underside of the head 6 is cut open in the longitudinal direction of the bore, so that two lugs spaced apart are provided. A copper soldering-bit (1, preferably divided in the vertical plane wg indicated in Fig. 2, 1s lnserted from below between these lugs. One single screw 0 serves for clamping the bit d between the said lugs, and the heater (4 in the bore m. The latter is closed by end covers 9 and it let into the two ends of the head b.

Two pins 2' are provided diametrically opposite one another in the heater parallel with its longitudinal axis, to which pins the ends of the resistance a are connected. The pins z' are electrically connected with current supply leads 7) by connectors k, as clearly shown in Fig. 5. In order as far as possible to prevent loss of heat by the head 6, its top and sides are covered with a layer 6 of heat insulating material, such as asbestos, which in turn is covered with sheet metal 7'.

It will be appreciated that the described soldering-iron has the advantage that its heater can be readily inserted in its correct position fitting into the head of the iron, so that eflicient transference of heat from it to the head b and its bit (Z is assured.

I claim z- 1. In an electric solderingiro11, the combination of a head having a bore extending in the direction of the handle, which head has an extension at substantially right angles to the axis of the head, said extension being provided with a cut that opens into, and extends in the same direction as, the said bore, an electric heater clamped in said bore, and a bit secured in said cut, substantially as set forth.

2. In an electric soldering-iron, the com- .bination of a head having a cylindrical bore extending in the direction of the handle, and having twolugs at substantially right angles to the axis of the head spaced apart disposed in the same said direction as the bore, an electric heater fitting into said bore, a bit fitting into the space between said lugs, and means clamping the heater in said bore and the bit between said lugs, substantially as set forth.

3. In an electric soldering-iron, the com bination of a head having a bore extending in the direction of the handle, which head has in one side a cut that opens into, and extends in the same direction as, said bore, a bit secured in said out, and an electric heater clamped in said bore, which heater comprises a resistance wire and two pins that are connected with the latter, and project outward from one end of the heater, substantially as and for the purpose set forth.

4. In an electric soldering-iron, the combination of an aluminium head having a cylindrical bore, and two lugs spaced apart on one side thereof extending in the axial direction of the head, an electric heater fitted into said bore, a bit fitted between said lugs, two cover plates fitted one on each end of the head and closing said bore, and a screw arranged in said lugs for clamping said heater in said bore and said bit between said lugs, said heater comprising a resistance wire, and two connecting pins that are connected to the ends of the latter and extend through one of said cover plates, substantially as set forth.

In testimony whereof, I afiix my signature.

FERD. EICHENBERGER. 

